From Porous to Dense Nanostructured beta-Ti alloys through High-Pressure Torsion

Autor(es)

Afonso, Conrado R. M. ^[1] ; Amigo, Angelica ^[2] ; Stolyarov, Vladimir ^{[3, 4]} ; Gunderov, Dmitri ^[5] ; Amigo, Vicente ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Mat Engn DEMa, Rod Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Politecn Valencia, Inst Mat Technol ITM, Cami Vera S-N, E-46022 Valencia - Spain

^[3] Mech Engn Res Inst RAS, Moscow 101990 - Russia

^[4] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409 - Russia

^[5] St Petersburg State Univ, St Petersburg 198504 - Russia

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 7, OCT 19 2017.
• Citações Web of Science: 7

Resumo

beta-Ti alloys have low elastic modulus, good specific strength and high corrosion resistance for biomaterial applications. Noble elements, such as Nb, Ta and Mo, are used to obtain beta-Ti due to their chemical biocompatibility. However, due to their refractory nature, beta-Ti requires specific processing routes. Powder metallurgy (P/M) allows for the development of new beta-Ti alloys with decreasing costs, but dealing with high-elemental-content alloys can lead to a lack of diffusion and grain growth. One method to refine the structure and improve mechanical properties is a severe plastic deformation technique through high-pressure torsion (HPT). The aim of this work was to evaluate the conversion of P/M porous beta-Ti-35Nb-10Ta-xFe alloys to dense nanostructures through high-pressure torsion in one deformation step and the influence of the structure variation on the properties and microstructure. TEM analysis and ASTAR crystallographic mapping was utilized to characterize the nanostructures, and the properties of P/M beta Ti-35Nb-10Ta-xFe alloys processed by HPT were compared. The initial microstructure consisted mainly by the beta-Ti phase with some alpha-Ti phase at the grain boundaries. The HPT process refined the microstructure from 50 mu m (P/M) down to nanostructured grains of approximately 50 nm. (AU)

• Processo FAPESP: 15/19978-6 - Caracterização avançada através de TEM de amostras preparadas por FIB de recobrimentos de ligas nanocristalinas produzidos por aspersão térmica e laser cladding
• Beneficiário: Conrado Ramos Moreira Afonso
• Modalidade de apoio: Bolsas no Exterior - Pesquisa